Global Patent Index - EP 1357658 B1

EP 1357658 B1 20091028 - Protection circuit against voltage transients and polarity reversal

Title (en)

Protection circuit against voltage transients and polarity reversal

Title (de)

Schaltungsanordnung zum Schutz gegen transiente Spannungen und Spannungsverpolung

Title (fr)

Circuit de protection contre les tensions transitoires et les invesions de polarité

Publication

EP 1357658 B1 20091028 (EN)

Application

EP 02291010 A 20020422

Priority

EP 02291010 A 20020422

Abstract (en)

[origin: EP1357658A1] Protection circuits (1) to be located between power supplies (2) and further circuitries (20,30) for protecting further circuitries (20,30) against voltage irregularities and comprising main transistors (7) coupled to switching circuits (10) for rendering main transistors (7) operative/non-operative can be made more allround by providing them with comparators (11) for controlling gate voltages of main transistors (7) via switches (12,13) to get protection against small negative voltage pulses and voltage fluctuations. Said switches (12,13) comprise two switches (12,13) for interrupting a reference voltage generated by a reference voltage source and for supplying a nearby ground voltage to said gate. A diode (14) between switch (13) and gate allows negative voltages at said gate for simplifying the introduction of further stages. Thick oxide transistors (15) protect further circuitries (20,30) and main transistors (7) against large negative voltage pulses. Capacitors (16) and resistors (17) coupled parallelly to thick oxide transistors (15) protect against large negative voltage pulses and reverse polarity. Serial transistors (21) are coupled anti-serially to main transistors (7) to get protection against large positive voltage pulses. <IMAGE>

IPC 8 full level

H02H 11/00 (2006.01)

CPC (source: EP US)

H02H 11/003 (2013.01 - EP US)

Designated contracting state (EPC)

DE FR

DOCDB simple family (publication)

EP 1357658 A1 20031029; EP 1357658 B1 20091028; EP 1357658 B8 20091216; DE 60234158 D1 20091210; US 2003218844 A1 20031127; US 6909585 B2 20050621

DOCDB simple family (application)

EP 02291010 A 20020422; DE 60234158 T 20020422; US 41042003 A 20030409